fix: allow accessing vue-router properties in property initializers (#434)

Author: ktsn

src/data.ts

@@ -17,13 +17,11 @@ export function collectDataFromConstructor (vm: Vue, Component: VueClass<Vue>) {
       }
     }
     keys.forEach(key => {
-      if (key.charAt(0) !== '_') {
-        Object.defineProperty(this, key, {
-          get: () => vm[key],
-          set: value => { vm[key] = value },
-          configurable: true
-        })
-      }
+      Object.defineProperty(this, key, {
+        get: () => vm[key],
+        set: value => { vm[key] = value },
+        configurable: true
+      })
     })
   }